期刊文献+
共找到102篇文章
< 1 2 6 >
每页显示 20 50 100
A LATTICE BOLTZMANN SUBGRID MODEL FOR LID-DRIVEN CAVITY FLOW 被引量:2
1
作者 YANGFan LIUShu-hong +1 位作者 WUYu-lin TANGXue-lin 《Journal of Hydrodynamics》 SCIE EI CSCD 2005年第3期289-294,共6页
In recent years, the Lattice Boltzmann Method (LBM) has developed into an alternative and promising numerical scheme for simulating fluid flows and modeling physics in fluids. In order to propose LBM for high Reynolds... In recent years, the Lattice Boltzmann Method (LBM) has developed into an alternative and promising numerical scheme for simulating fluid flows and modeling physics in fluids. In order to propose LBM for high Reynolds number fluid flow applications, a subgrid turbulence model for LBM was introduced based on standard Smagorinsky subgrid model and Lattice Bhatnagar-Gross-Krook (LBGK) model. The subgrid LBGK model was subsequently used to simulate the two-dimensional driven cavity flow at high Reynolds numbers. The simulation results including distribution of stream lines, dimensionless velocities distribution, values of stream function, as well as location of vertex center, were compared with benchmark solutions, with satisfactory agreements. 展开更多
关键词 Lattice Boltzmann Method (LBM) Lattice Bhatnagar-Gross-Krook (LBGK) model Smagorinsky subgrid model driven cavity flow
原文传递
Evaluation of Subgrid-scale Models in Large-eddy Simulations of Turbulent Flow in a Centrifugal Pump Impeller 被引量:16
2
作者 YANG Zhengjun WANG Fujun ZHOU Peijian 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2012年第5期911-918,共8页
The current research of large eddy simulation (LES) of turbulent flow in pumps mainly concentrates in applying conventional subgrid-scale (SGS) model to simulate turbulent flow, which aims at obtaining the flow fi... The current research of large eddy simulation (LES) of turbulent flow in pumps mainly concentrates in applying conventional subgrid-scale (SGS) model to simulate turbulent flow, which aims at obtaining the flow field in pump. The selection of SGS model is usually not considered seriously, so the accuracy and efficiency of the simulation cannot be ensured. Three SGS models including Smagorinsky-Lilly model, dynamic Smagorinsky model and dynamic mixed model are comparably studied by using the commercial CFD code Fluent combined with its user define function. The simulations are performed for the turbulent flow in a centrifugal pump impeller. The simulation results indicate that the mean flows predicted by the three SGS models agree well with the experimental data obtained from the test that detailed measurements of the flow inside the rotating passages of a six-bladed shrouded centrifugal pump impeller performed using particle image velocimetry (PIV) and laser Doppler velocimetry (LDV). The comparable results show that dynamic mixed model gives the most accurate results for mean flow in the centrifugal pump impeller. The SGS stress of dynamic mixed model is decompose into the scale similar part and the eddy viscous part. The scale similar part of SGS stress plays a significant role in high curvature regions, such as the leading edge and training edge of pump blade. It is also found that the dynamic mixed model is more adaptive to compute turbulence in the pump impeller. The research results presented is useful to improve the computational accuracy and efficiency of LES for centrifugal pumps, and provide important reference for carrying out simulation in similar fluid machineries. 展开更多
关键词 large-eddy simulation subgrid-scale model dynamic mixed model centrifugal pump
下载PDF
A SECOND-ORDER DYNAMIC SUBGRID-SCALE STRESS MODEL
3
作者 龚洪瑞 陈十一 +1 位作者 何国威 曹念铮 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2000年第2期165-172,共8页
A second-order dynamic model based on the general relation between the subgrid-scale stress and the velocity gradient tensors was proposed. A priori test of the second-order model was made using moderate resolution di... A second-order dynamic model based on the general relation between the subgrid-scale stress and the velocity gradient tensors was proposed. A priori test of the second-order model was made using moderate resolution direct numerical simulation date at high Reynolds number ( Taylor microscale Reynolds number R-lambda = 102 similar to 216) for homogeneous, isotropic forced flow, decaying flow, and homogeneous rotating flow. Numerical testing shows that the second-order dynamic model significantly improves the correlation coefficient when compared to the first-order dynamic models. 展开更多
关键词 turbulent now dynamic model subgrid-scale stress model Smagorinsky model
下载PDF
Stochastic modeling of subgrid-scale effects on particle motion in forced isotropic turbulence
4
作者 Haoshu Shen YuxinWu +2 位作者 Minmin Zhou Hai Zhang Guangxi Yue 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第12期2884-2891,共8页
The subgrid-scale effects on particle motion were investigated in forced isotropic turbulence by DNS and priorLES methods.In the DNS field,the importance of Kolmogorov scaling to preferential accumulation was validate... The subgrid-scale effects on particle motion were investigated in forced isotropic turbulence by DNS and priorLES methods.In the DNS field,the importance of Kolmogorov scaling to preferential accumulation was validated by comparing the radial distribution functions under various particle Stokes numbers.The prior-LES fields were generated by filtering the DNS data.The subgrid-scale Stokes number(StSGS)is a useful tool for determining the effects of subgrid-scale eddies on particle motion.The subgrid-scale eddies tend to accumulate particles with StSGSb 1 and disperse particles with 1 b StSGSb 10.For particles with StSGS?1,the effects of subgrid-scale eddies on particle motion can be neglected.In order to restore the subgrid-scale effects,the Langevin-type stochastic model with optimized parameters was adopted in this study.This model is effective for the particles with StSGS N 1 while has an adverse impact on the particles with StSGSb 1.The results show that the Langevin-type stochastic model tends to smooth the particle distribution in the isotropic turbulence. 展开更多
关键词 Particle DISPERSION subgrid-SCALE modeling FORCED ISOTROPIC TURBULENCE STOKES number
下载PDF
A new mixed subgrid-scale model for large eddy simulation of turbulent drag-reducing flows of viscoelastic fluids
5
作者 李凤臣 王璐 蔡伟华 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第7期293-309,共17页
A mixed subgrid-scale(SGS) model based on coherent structures and temporal approximate deconvolution(MCT) is proposed for turbulent drag-reducing flows of viscoelastic fluids. The main idea of the MCT SGS model is... A mixed subgrid-scale(SGS) model based on coherent structures and temporal approximate deconvolution(MCT) is proposed for turbulent drag-reducing flows of viscoelastic fluids. The main idea of the MCT SGS model is to perform spatial filtering for the momentum equation and temporal filtering for the conformation tensor transport equation of turbulent flow of viscoelastic fluid, respectively. The MCT model is suitable for large eddy simulation(LES) of turbulent dragreducing flows of viscoelastic fluids in engineering applications since the model parameters can be easily obtained. The LES of forced homogeneous isotropic turbulence(FHIT) with polymer additives and turbulent channel flow with surfactant additives based on MCT SGS model shows excellent agreements with direct numerical simulation(DNS) results. Compared with the LES results using the temporal approximate deconvolution model(TADM) for FHIT with polymer additives, this mixed SGS model MCT behaves better, regarding the enhancement of calculating parameters such as the Reynolds number.For scientific and engineering research, turbulent flows at high Reynolds numbers are expected, so the MCT model can be a more suitable model for the LES of turbulent drag-reducing flows of viscoelastic fluid with polymer or surfactant additives. 展开更多
关键词 turbulent drag reduction large eddy simulation viscoelastic fluid subgrid-scale model
下载PDF
Rational subgrid-scale modelling: a short survey
6
作者 L.Fang L.P.Lu 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2018年第3期143-146,共4页
We review the previous attempts of rational subgrid-scale (SGS) modelling by employing theKolmogorov equation of filtered quantities. Aiming at explaining and solving the underlyingproblems in these models, we ... We review the previous attempts of rational subgrid-scale (SGS) modelling by employing theKolmogorov equation of filtered quantities. Aiming at explaining and solving the underlyingproblems in these models, we also introduce the recent methodological investigations for therational SGS modelling technique by defining the terms of assumption and restriction. Thesemethodological works are expected to provide instructive criterions for not only the rational SGSmodelling, but also other types of SGS modelling practices. 展开更多
关键词 subgrid-scale modelling Kolmogorov equation Scaling law Eddy-viscosity assumption
下载PDF
Large Eddy Simulation of Stratified Turbulent Channel Flow with a Dynamic Subgrid Scale Model
7
作者 Feng-quan Zhong Nan-sheng Liu +1 位作者 Xi-yun Lu Bing-gang Tong 《Advances in Manufacturing》 2000年第2期87-91,共5页
In this paper, large eddy simulation coupled with a dynamic subgrid scale (SGS) model is used to study turbulent channel flows with heat transfer. Some fundamental flow behaviors are discussed. Based on our calculate... In this paper, large eddy simulation coupled with a dynamic subgrid scale (SGS) model is used to study turbulent channel flows with heat transfer. Some fundamental flow behaviors are discussed. Based on our calculated results, the dynamic SGS model can reasonably predict some main characteristics of stratified turbulent channel flows. Our results are also in good agreement with theoretical analyses and previous calculated results. 展开更多
关键词 large eddy simulation (LES) subgrid scale (SGS) model stratified turbulence heat transfer
下载PDF
A distributed Grid-Xinanjiang model with integration of subgrid variability of soil storage capacity
8
作者 Wei-jian Guo Chuan-hai Wang +2 位作者 Teng-fei Ma Xian-min Zeng Hai Yang 《Water Science and Engineering》 EI CAS CSCD 2016年第2期97-105,共9页
Realistic hydrological response is sensitive to the spatial variability of landscape properties. For a grid-based distributed rainfall-runoff model with a hypothesis of a uniform grid, the high-frequency information w... Realistic hydrological response is sensitive to the spatial variability of landscape properties. For a grid-based distributed rainfall-runoff model with a hypothesis of a uniform grid, the high-frequency information within a grid cell will be gradually lost as the resolution of the digital elevation model(DEM) grows coarser. Therefore, the performance of a hydrological model is usually scale-dependent. This study used the GridXinanjiang(GXAJ) model as an example to investigate the effects of subgrid variability on hydrological response at different scales. With the aim of producing a more reasonable hydrological response and spatial description of the landscape properties, a new distributed rainfall-runoff model integrating the subgrid variability(the GXAJSV model) was developed. In this model, the topographic index is used as an auxiliary variable correlated with the soil storage capacity. The incomplete beta distribution is suggested for simulating the probability distribution of the soil storage capacity within the raster grid. The Yaogu Basin in China was selected for model calibration and validation at different spatial scales.Results demonstrated that the proposed model can effectively eliminate the scale dependence of the GXAJ model and produce a more reasonable hydrological response. 展开更多
关键词 SCALE effect subgrid VARIABILITY SOIL STORAGE capacity INCOMPLETE BETA distribution GXAJSV model
下载PDF
Assessment of the modulated gradient model in decaying isotropic turbulence 被引量:2
9
作者 Hao Lu a) Saint Anthony Falls Laboratory,Department of Civil Engineering,University of Minnesota-Twin Cities,2 3rd Ave.SE,Minneapolis,MN 55414,USA 《Theoretical & Applied Mechanics Letters》 CAS 2011年第4期23-27,共5页
A recently introduced nonlinear model undergoes evaluations based on two isotropic turbulent cases:a University of Wiscosion-Madison case at a moderate Reynolds number and a Johns Hopkins University case at a high Rey... A recently introduced nonlinear model undergoes evaluations based on two isotropic turbulent cases:a University of Wiscosion-Madison case at a moderate Reynolds number and a Johns Hopkins University case at a high Reynolds number.The model uses an estimation of the subgrid-scale(SGS) kinetic energy to model the magnitude of the SGS stress tensor,and uses the normalized velocity gradient tensor to model the structure of the SGS stress tensor.Testing is performed for the first case through a comparison between direct numerical simulation(DNS) results and large eddy simulation(LES) results regarding resolved kinetic energy and energy spectrum.In the second case,we examine the resolved kinetic energy,the energy spectrum,as well as other key statistics including the probability density functions of velocities and velocity gradients,the skewness factors,and the flatness factors.Simulations using the model are numerically stable,and results are satisfactorily compared with DNS results and consistent with statistical theories of turbulence. 展开更多
关键词 large-eddy simulation subgrid-scale model isotropic turbulence
下载PDF
LARGE-EDDY SIMULATIONS OF TURBULENT CAVITY FLOWS WITH DYNAMIC SGS MODEL AND LBM ALGORITHM
10
作者 Guan Hui (College of Science, PLA of University of Science and Technology Nanjing 211101,P.R.China) Wu Chuijie (State Key Lab. of Turbulence Study, Peking University Beijing 100871,P.R.China) 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2001年第z1期60-63,共4页
A new method of dynamic SGS model with LBM is described in detail and a new average method of eliminating the inherent unphysical oscillation of LBM are given in this paper. Results using the method to simulate the tw... A new method of dynamic SGS model with LBM is described in detail and a new average method of eliminating the inherent unphysical oscillation of LBM are given in this paper. Results using the method to simulate the two and three dimensional cavity flows are shown. 展开更多
关键词 DYNAMIC subgrid model LATTICE BOLTZMANN method TURBULENCE
下载PDF
Applications of a Surface Runoff Model with Horton and Dunne Runoff for VIC 被引量:19
11
作者 谢正辉 苏凤阁 +3 位作者 曾庆存 郭裕福 梁旭 郝振纯 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2003年第2期165-172,共8页
Surface runoff is mainly generated by two mechanisms, infiltration excess (Horton) runoff and saturation excess (Dunne) runoff; and the spatial variability of soil properties, antecedent soil moisture, topography, and... Surface runoff is mainly generated by two mechanisms, infiltration excess (Horton) runoff and saturation excess (Dunne) runoff; and the spatial variability of soil properties, antecedent soil moisture, topography, and rainfall will result in different surface runoff generation mechanisms. For a large area (e.g., a model grid size of a regional climate model or a general circulation model), these runoff generation mechanisms are commonly present at different portions of a grid cell simultaneously. Missing one of the two major runoff generation mechanisms and failing to consider spatial soil variability can result in significant under/over estimation of surface runoff which can directly introduce large errors in soil moisture states over each model grid cell. Therefore, proper modeling of surface runoff is essential to a reasonable representation of feedbacks in a land-atmosphere system. This paper presents a new surface runoff parameterization with the Philip infiltration formulation that dynamically represents both the Horton and Dunne runoff generation mechanisms within a model grid cell. The parameterization takes into account the effects of soil heterogeneity on Horton and Dunne runoff. The new parameterization is implemented into the current version of the hydrologically based Variable Infiltration Capacity (VIC) land surface model and tested over one watershed in Pennsylvania, USA and over the Shiguanhe Basin in the Huaihe Watershed in China. Results show that the new parameterization plays a very important role in partitioning the water budget between surface runoff and soil moisture in the atmosphere-land coupling system, and has potential applications on large hydrological simulations and land-atmospheric interactions. It is further found that the Horton runoff mechanism should be considered within the context of subgrid-scale spatial variability of soil properties and precipitation. 展开更多
关键词 Horton runoff Dunne runoff subgrid-scale spatial variability soil heterogeneity land surface model hydrologic model soil moisture
下载PDF
风琴管喷嘴空化水射流流场的大涡模拟
12
作者 王连安 徐艳 +3 位作者 王尊策 李森 张井龙 刘海水 《机械科学与技术》 CSCD 北大核心 2024年第9期1514-1521,共8页
针对空化水射流流场空化云演化采用RANS方法模拟不准确的问题,采用大涡模拟(Large-eddy simulation,LES)对风琴管空化喷嘴流场进行数值模拟。基于Mixture多相流模型和Zwart-Gerber-Belamri(ZGB)空化模型,分别采用SM模型(Smagorinsky-Lil... 针对空化水射流流场空化云演化采用RANS方法模拟不准确的问题,采用大涡模拟(Large-eddy simulation,LES)对风琴管空化喷嘴流场进行数值模拟。基于Mixture多相流模型和Zwart-Gerber-Belamri(ZGB)空化模型,分别采用SM模型(Smagorinsky-Lilly model,SM)、壁面适应的局部涡黏模型(Wall-adapted local eddy-viscous,WALE)和代数壁面模型(Wall-modeled large eddy simulation,WMLES)3种不同的亚格子模型,对风琴管喷嘴空化水射流流场进行数值模拟,分析空化水射流特性、空化云演化规律及脱落频率。结果表明:WALE模型可以较为准确模拟空化云演化周期,与高速摄像拍摄结果吻合较好;在喷嘴内圆柱段以及扩散段壁面附近产生涡环,加快了空化泡析出,WALE模型较好的模拟了涡环结构;涡量分析表明涡流在喷嘴出口附近出现,射流的末端空化泡破碎产生扰动,大尺度涡演化为小尺度涡,WALE模型模拟出涡的破碎范围较SM模型更大,WMLES模型未捕捉到小尺度涡。 展开更多
关键词 大涡模拟 亚格子模型 风琴管喷嘴 空化水射流
下载PDF
大涡模拟在内燃机中应用的研究进展 被引量:9
13
作者 周磊 解茂昭 +2 位作者 罗开红 帅石金 贾明 《力学学报》 EI CSCD 北大核心 2013年第4期467-482,共16页
大涡模拟能够以比较合理的计算成本,提供更多详细的湍流信息,故近年来已经广泛地应用于科学和工程领域,并也成为内燃机缸内湍流流动与燃烧过程模拟计算的最有潜力的数值方法.综合现有研究成果,对内燃机中大涡模拟的研究进展和模拟方法... 大涡模拟能够以比较合理的计算成本,提供更多详细的湍流信息,故近年来已经广泛地应用于科学和工程领域,并也成为内燃机缸内湍流流动与燃烧过程模拟计算的最有潜力的数值方法.综合现有研究成果,对内燃机中大涡模拟的研究进展和模拟方法进行了比较全面的评述.介绍了大涡模拟的基本概念、方法、亚网格模型,着重讨论了内燃机缸内冷态流场、燃油喷雾过程以及两相液雾湍流燃烧大涡模拟的国内外研究进展.最后论述了大涡模拟在内燃机应用中当前需要解决的问题及其发展趋势. 展开更多
关键词 大涡模拟 亚网格模型 湍流 内燃机
下载PDF
水下航行体壁面脉动压力的大涡模拟研究 被引量:13
14
作者 张楠 沈泓萃 +2 位作者 姚惠之 田于逵 谢华 《水动力学研究与进展(A辑)》 CSCD 北大核心 2010年第1期106-112,共7页
湍流壁面脉动压力是重要的水动力噪声源,开展相应的计算与试验研究十分必要。作者在大涡模拟的理论框架下,结合精细网格生成技术,对于水下航行体的壁面脉动压力进行了数值预报。首先,详细描述了所使用的大涡模拟方程与动态Smagorinsky... 湍流壁面脉动压力是重要的水动力噪声源,开展相应的计算与试验研究十分必要。作者在大涡模拟的理论框架下,结合精细网格生成技术,对于水下航行体的壁面脉动压力进行了数值预报。首先,详细描述了所使用的大涡模拟方程与动态Smagorinsky亚格子模型,介绍了离散求解的数值方法。其次,利用大涡模拟计算了SUBOFF模型主体与附体上的表面压力分布,并利用试验结果进行了验证,分析了大涡模拟方法计算定常流动的可靠性。再次,计算了平板的湍流壁面脉动压力,并与CSSRC的消音风洞试验结果进行了对比,分析了大涡模拟方法计算非定常流动的可靠性。最后,对于水下航行体模型主体上三个位置与围壳上四个位置处的壁面脉动压力进行了大涡模拟,得到了脉动压力1/3OCT频谱,分析了频谱高频与低频特性以及衰减特性,并用试验结果进行了验证。研究表明,本文建立的水下航行体壁面脉动压力的数值预报方法是可靠的。 展开更多
关键词 壁面脉动压力 水下航行体 大涡模拟 动态Smagorinsky亚格子涡模型
下载PDF
代数亚格子湍动能模型及非黏性亚格子应力模型在喷雾大涡模拟中的应用 被引量:4
15
作者 周磊 解茂昭 +3 位作者 罗开红 帅石金 贾明 秦文瑾 《内燃机学报》 EI CAS CSCD 北大核心 2013年第3期215-221,共7页
在KIVA3V中将考虑简化的代数亚格子湍动能模型的3种亚格子尺度模型和K方程湍动能模型的非黏性亚格子应力模型纳入程序中,对定容弹中柴油的喷射和雾化过程进行了数值研究.以燃油液相和蒸气相分布的试验数据为依据,揭示了代数亚格子尺度... 在KIVA3V中将考虑简化的代数亚格子湍动能模型的3种亚格子尺度模型和K方程湍动能模型的非黏性亚格子应力模型纳入程序中,对定容弹中柴油的喷射和雾化过程进行了数值研究.以燃油液相和蒸气相分布的试验数据为依据,揭示了代数亚格子尺度湍动能模型对燃油喷雾计算结果的影响,并且与K方程亚格子湍动能模型进行了对比,同时分析了加入的非黏性亚格子应力张量模型的适用性.结果显示3种亚格子应力模型及代数亚格子湍动能模型的组合可以有效地模拟流场中湍动能变化对液滴弥散速度的影响,从而使液相贯穿距及液相和气相浓度分布与试验结果更为接近.同时,该代数模型所计算的亚格子尺度湍动能与K方程模型计算结果相当吻合.非黏性亚格子模型可以计算相对准确的喷雾结果. 展开更多
关键词 亚格子模型 湍动能 喷雾 大涡模拟
下载PDF
多孔介质内流体流动的大涡格子Boltzmann方法研究 被引量:6
16
作者 周昊 芮淼 岑可法 《浙江大学学报(工学版)》 EI CAS CSCD 北大核心 2012年第9期1660-1665,共6页
为研究多孔介质内流动随Re数变化的特点,采用结合Smagorinsky亚格子模型的格子Boltzmann方法(LES-LBM)对多孔介质内流动进行了数值模拟.结果表明:多孔介质内的单相流动在高Re数时会表现出复杂的非线性现象;LES-LBM克服了传统LBGK方法模... 为研究多孔介质内流动随Re数变化的特点,采用结合Smagorinsky亚格子模型的格子Boltzmann方法(LES-LBM)对多孔介质内流动进行了数值模拟.结果表明:多孔介质内的单相流动在高Re数时会表现出复杂的非线性现象;LES-LBM克服了传统LBGK方法模拟高Re数流动时容易产生数值不稳定的缺点,能清晰地描述出多孔介质内流动存在的3个区域,即低速时的线性达西区、过渡区和高速时的非线性二次区;不同Re下的流线图还说明微观的惯性作用最终导致了多孔介质宏观上的非线性现象,多孔介质流动呈现明显的多尺度特征.进一步分析计算结果可以证明:LES-LBM方法能准确地验证Darcy-Forchhimer阻力方程,Darcy-Forchhimer总阻力随Re数增加而增加,随孔隙率增加而减小,并且小孔隙率下的Forchhimer阻力占总阻力比例小于大孔隙率时的比例. 展开更多
关键词 格子BOLTZMANN方法 大涡模拟 亚格子模型 非达西流 Darcy-Forchhimer阻力
下载PDF
新型大涡数值模拟亚格子模型及应用 被引量:4
17
作者 崔桂香 周海兵 +1 位作者 张兆顺 L.Shao 《计算物理》 CSCD 北大核心 2004年第3期289-293,共5页
 基于湍流大小尺度间动量输运的结构函数方程,提出了一种新的湍流大涡模型(LES)亚格子涡粘模式.新亚格子涡粘系数正比于纵向速度增量的扭率,它表征大小尺度湍流间的能量输运和耗散之比.新模式通过各向同性湍流直接数值模拟数据库的检验...  基于湍流大小尺度间动量输运的结构函数方程,提出了一种新的湍流大涡模型(LES)亚格子涡粘模式.新亚格子涡粘系数正比于纵向速度增量的扭率,它表征大小尺度湍流间的能量输运和耗散之比.新模式通过各向同性湍流直接数值模拟数据库的检验,并用于槽道湍流的大涡模拟计算,将所得结果与DNS结果进行了比较. 展开更多
关键词 流体力学 大涡数值模拟 亚格子模式 涡粘性 结构函数 湍流
下载PDF
基于Lattice Boltzmann方法的圆柱绕流大涡模拟 被引量:5
18
作者 郭照立 郑楚光 柳朝晖 《工程热物理学报》 EI CAS CSCD 北大核心 2002年第4期479-481,共3页
Lattice Boltzmann(LB)方法是近年来出现的一种流体计算的新方法,在流体力学及相关领域取得了很大的成功。但LB方法在模拟湍流流动时常常引起计算的不稳定。本文基于一种结合大涡模型的LB方法对圆柱绕流问题进行的模拟,并与其他文献的... Lattice Boltzmann(LB)方法是近年来出现的一种流体计算的新方法,在流体力学及相关领域取得了很大的成功。但LB方法在模拟湍流流动时常常引起计算的不稳定。本文基于一种结合大涡模型的LB方法对圆柱绕流问题进行的模拟,并与其他文献的实验结果和计算结果进行对比。计算表明:这种混合LB方法能获得比较满意的结果。 展开更多
关键词 LatticeBoltzmann方法 大涡模拟 亚格子模型
下载PDF
大涡模拟及其在湍流燃烧中的应用 被引量:17
19
作者 刘奕 郭印诚 +2 位作者 张会强 王希麟 林文漪 《力学进展》 EI CSCD 北大核心 2001年第2期215-216,共2页
大涡模拟作为一种研究湍流流动和湍流燃烧的有效手段,在国际上已经得到广泛应用.本文在回顾了大涡模拟(LES)的基本思想及其实施方法的基础上着重介绍了前人在大涡模拟的亚格子湍流模式和亚格子燃烧模式中的研究成果,同时给出了... 大涡模拟作为一种研究湍流流动和湍流燃烧的有效手段,在国际上已经得到广泛应用.本文在回顾了大涡模拟(LES)的基本思想及其实施方法的基础上着重介绍了前人在大涡模拟的亚格子湍流模式和亚格子燃烧模式中的研究成果,同时给出了采用不同亚格子模式的大涡模拟在湍流燃烧中的应用实例,指出了大涡模拟在湍流燃烧中的重要作用,为大涡模拟的进一步发展和应用提供参考。 展开更多
关键词 大涡模拟 亚格子模式 湍流燃烧 湍流流动
下载PDF
植被层湍流的大涡模拟 被引量:7
20
作者 李家春 谢正桐 《力学学报》 EI CSCD 北大核心 1999年第4期406-414,共9页
研究植被层湍流的大涡模拟,发展了一个TSF(transientstructurefunction)亚格于模式,尽可能真实地处理植被湍流这种既有强剪切,又有热对流的流动.我们建立了植被湍流数据库,并进行了较为详细的分析研究.湍流统计量如平均风速剖... 研究植被层湍流的大涡模拟,发展了一个TSF(transientstructurefunction)亚格于模式,尽可能真实地处理植被湍流这种既有强剪切,又有热对流的流动.我们建立了植被湍流数据库,并进行了较为详细的分析研究.湍流统计量如平均风速剖面、雷诺应力、湍流脉动能等等,与有关观测结果作了对比,符合较好.大涡模拟计算同样发现已由现场观测到的、在强对流情况时出现的温度场斜坡型有组织结构. 展开更多
关键词 植被层 湍流 大涡模拟 亚格子模式
下载PDF
上一页 1 2 6 下一页 到第
使用帮助 返回顶部